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Book Chapter

Terrestrial Cr-spinels in the Maiolica limestone: Where are they from?

By
Davide Lenaz
Davide Lenaz
Department of Mathematics and Geosciences, Trieste University, 34127 Trieste, Italy
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;
Birger Schmitz
Birger Schmitz
Astrogeobiology Laboratory, Department of Physics, Lund University, SE-22100 Lund, Sweden
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;
Walter Alvarez
Walter Alvarez
Department of Earth and Planetary Science, University of California, Berkeley, California 94707-4767, USA
Osservatorio Geologico di Coldigioco, Contrada Coldigioco, 62021 Apiro, Marche, Italy
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Publication history
15 January 201901 May 2019

ABSTRACT

In total, 33 and 65 chrome-spinel (Cr-spinel) grains in the >63 and 32–63 µm size fractions, respectively, were recovered from 12 beds in two stratigraphically separated groups along the 240-m-thick Monte Acuto section of the Maiolica limestone in central Italy, spanning from the Berriasian to the early Hauterivian. The chemistry of these detrital spinels suggests they may represent windblown ophiolitic detritus, showing the evolution of an ophiolite evolving from a mid-ocean-ridge basalt setting (Bosso section) to a suprasubduction-zone setting, including a backarc and an arc setting (Monte Acuto section). The source of the Maiolica detrital minerals may have been the obducting ophiolites of the Albanides and/or the Hellenides, which show a similar evolution. In this case, it is particularly important to note how the Cr-spinel detritus in the Maiolica limestone records this evolution over a relatively short period of time, lasting ~10 m.y.

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GSA Special Papers

250 Million Years of Earth History in Central Italy: Celebrating 25 Years of the Geological Observatory of Coldigioco

Geological Society of America
ISBN electronic:
9780813795423

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